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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c6be5664fe3afadbcefa4ef648e9a66d0c27d0c9f1f836293b97a60ae6bd23' 
  AND token = 'XqBV1OeH4x/iKafxxMYY+xpWNnpB5INyyrQk90Yb3Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}